Friborg (definition)

Fri"borg , Fri"borgh (?), n. [AS. friborh, lit., peace PLAGE; fri peace + borh, borg, pledge, akin to E. borrow. The first part of the word was confused with free, the last part, with borough.] Old Eng.Law

The pledge and tithing, afterwards called by the Normans frankpledge. See Frankpledge.